Liquid crystal display module

Abstract

A liquid crystal display module includes a backlight module, a ferroelectric liquid crystal layer and a liquid crystal panel. The ferroelectric liquid crystal layer is disposed on the backlight module. The liquid crystal panel is disposed on the ferroelectric liquid crystal layer, in which the displayer region of the liquid crystal panel has plural dimming regions. In which, the ferroelectric liquid crystal layer is configured to block the penetration lights of the backlight module corresponding to the others of the dimming regions when the gray level of one of the dimming regions changes.

Description

[Technical Field]

[0001] This disclosure relates to a liquid crystal display module, and more particularly to a liquid crystal display module comprising a ferroelectric liquid crystal layer. [Previous Technology]

[0002] Field sequential color display (FSC) is a type of display with high luminous efficiency and a wide color gamut. However, high-frequency, rapid switching of color fields can cause severe color breakup, which not only affects image quality but also causes visual fatigue for the viewer. To reduce color breakup, faster liquid crystals are needed. However, when the deflection rate of liquid crystal molecules is not fast enough, scanning backlighting can be used to solve the color breakup problem. But the display still suffers from light diffusion, which reduces the color gamut and makes the image uneven. [Summary of the Invention]

[0003] Some embodiments of this disclosure provide a liquid crystal display module. By providing a ferroelectric liquid crystal layer between the backlight module and the liquid crystal display panel, it can block the light source outside the target area before the liquid crystal display panel is fully turned on or off. In this way, the light amplification problem of the display panel can be effectively solved, thereby reducing light source color mixing and improving the color gamut. In addition, the number of regions of the plurality of ferroelectric liquid crystal cells in the ferroelectric liquid crystal layer can be designed to be independently controlled, so that the backlight module does not need to consider duty cycle design and scanning design, and the effect of a scanning backlight module can be achieved solely by the ferroelectric liquid crystal layer. In this way, the backlight module does not need to use microchip control, which can reduce the cost and energy consumption of the backlight module.

[0004] In accordance with the above objectives, some embodiments of this disclosure provide a liquid crystal display module. This liquid crystal display module includes a backlight module, a ferroelectric liquid crystal layer, and a liquid crystal panel. The ferroelectric liquid crystal layer is disposed on the backlight module. The liquid crystal panel is disposed on the ferroelectric liquid crystal layer, wherein the display area of ​​the liquid crystal panel has a plurality of dimming areas. When the grayscale of one of these dimming areas changes, the ferroelectric liquid crystal layer blocks the transmitted light from the backlight module corresponding to the other dimming areas.

[0005] According to some embodiments of the present disclosure, the ferroelectric liquid crystal layer includes a plurality of ferroelectric liquid crystal cell regions arranged along an X direction, which are sequentially turned off along the X direction during the frame time.

[0006] According to some embodiments of the present disclosure, during the screen time, the first off time of one of these ferroelectric liquid crystal cell regions partially overlaps with the second off time of the other of these ferroelectric liquid crystal cell regions.

[0007] According to some embodiments of the present disclosure, the screen time includes a first time interval and a second time interval, and the first grayscale value of the ferroelectric liquid crystal layer in the first time interval is less than the second grayscale value of the ferroelectric liquid crystal layer in the second time interval.

[0008] According to some embodiments of this disclosure, the first grayscale value is the minimum grayscale value in the frame time.

[0009] According to some embodiments of this disclosure, the second grayscale value is the maximum grayscale value in the frame time.

[0010] According to some embodiments of the present disclosure, the backlight module has a light-emitting surface comprising a plurality of partitions, one of which is an overlap of the other of the ferroelectric liquid crystal cell regions.

[0011] According to some embodiments of the present disclosure, during the screen time, the first turn-on time of these ferroelectric liquid crystal cell regions overlaps with the second turn-on time of these partitions.

[0012] According to some embodiments of the present disclosure, during the screen time, the first off time of these ferroelectric liquid crystal cell regions overlaps with the third off time of these partitions.

[0013] According to some embodiments of the present disclosure, the first frame rate of the ferroelectric liquid crystal layer is greater than the second frame rate of the liquid crystal panel.

Implementation Method

[0014] The embodiments of this disclosure are discussed in detail below. However, it should be understood that the embodiments provide many applicable concepts that can be implemented in a wide variety of specific situations. The embodiments discussed and disclosed are for illustrative purposes only and are not intended to limit the scope of this disclosure. The terms "first," "second," etc., used herein do not specifically refer to any order or sequence, but are merely used to distinguish components or operations described using the same technical terms.

[0015] Additionally, for ease of description, spatial relative terms such as “below,” “under,” “lower,” “above,” “upper,” and similar terms may be used herein to describe the relationship between one element or feature and another element or feature illustrated in the figures. In addition to the orientations depicted in the figures, spatial relative terms are also intended to cover different orientations of the device in use or operation. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used herein shall be interpreted accordingly. As used herein, “approximately,” “about,” “closely,” or “substantially” generally refer to within 20%, 10%, or 5% of a given value or range. The numerical quantities given herein are approximate, meaning that the terms “approximately,” “about,” “closely,” or “substantially” may be speculative unless explicitly specified.

[0016] Please refer to FIG1, which is an exploded view of a liquid crystal display module 100 according to a partial embodiment of the present disclosure. The liquid crystal display module 100 may include a backlight module 110, a ferroelectric liquid crystal layer 120, a first polarizing layer 130, a liquid crystal panel 140, and a second polarizing layer 150, wherein the backlight module 110, the ferroelectric liquid crystal layer 120, the first polarizing layer 130, the liquid crystal panel 140, and the second polarizing layer 150 are stacked sequentially along the Z direction. The liquid crystal display module 100 can be applied, for example, to a screen device, and the liquid crystal display module 100 can block color mixing caused by light amplification of the backlight module 110 by the ferroelectric liquid crystal layer 120 to obtain a better visual effect.

[0017] In some embodiments, the backlight module 110 may include a substrate 110A, a plurality of light-emitting elements 110B, and a film layer 110C, wherein the substrate 110A and the upper base film layer 110C are disposed opposite each other along the Z direction, and the light-emitting elements 110B are disposed between the substrate 110A and the upper base film layer 110C. The substrate 110A may be made of a reverse substrate or other suitable substrate, but is not limited thereto. The light-emitting elements 110B may be made of light-emitting diodes (LEDs), such as micro LEDs or sub-millimeter LEDs, but are not limited thereto. The film layer 110C may be made of a dual brightness enhancement film (DBEF) or other suitable material, but is not limited thereto.

[0018] In some embodiments, the ferroelectric liquid crystal layer 120 is disposed on the backlight module 110. The ferroelectric liquid crystal layer 120 may include a thin-film transistor layer 120A, a plurality of ferroelectric liquid crystal cell regions 120B arranged along the X direction, and an upper substrate 120C, wherein the thin-film transistor layer 120A and the upper substrate 120C are disposed opposite each other along the Z direction, and the ferroelectric liquid crystal cell regions 120B are disposed between the thin-film transistor layer 120A and the upper substrate 120C. The thin-film transistor layer 120A can be used to control the ferroelectric liquid crystal cell regions 120B. For example, the thin-film transistor layer 120A may include a plurality of thin-film transistors (TFTs) (not shown) electrically coupled to a control circuit (not shown), wherein these thin-film transistors receive pulse-width modulation (PWM) signals to control the on or off of the ferroelectric liquid crystal cell regions 120B. The upper substrate 120C may be made of a glass plate, a sapphire substrate, a combination thereof, and / or other suitable materials. In another embodiment, the upper substrate 120C may be made of a transparent polymer material, such as poly(methyl methacrylate) (PMMA), polyimide (PI), a combination thereof, and / or other suitable materials.

[0019] In some embodiments, the first polarizing layer 130 may be made of polyvinyl alcohol (PVA) or other suitable materials. The first polarizing layer 130 is used to effectively eliminate the effects of reflected light and scattered light after the light from the backlight module 110 passes through the first polarizing layer 130. For example, in this embodiment, the first polarizing layer 130 has a polarization direction parallel to the X direction to eliminate the effects of reflected light and scattered light in the Y direction. However, it should be noted that the configuration of the first polarizing layer 130 can be changed according to functional requirements and is not limited thereto.

[0020] In some embodiments, the liquid crystal panel 140 is disposed on the ferroelectric liquid crystal layer 120. The liquid crystal panel 140 can be various types of liquid crystal display panels, such as twisted nematic (TN), in-plane switching (IPS), fringe-field switching (FFS), or vertical alignment (VA). The liquid crystal panel 140 may include a lower substrate 140A, a liquid crystal layer 140B, and an upper substrate 140C, wherein the lower substrate 140A and the upper substrate 140C are disposed opposite each other along the Z direction, and the liquid crystal layer 140B is located between the lower substrate 140A and the upper substrate 140C. The lower substrate 140A and the upper substrate 140C may be made of glass, sapphire substrate, combinations thereof, and / or other suitable materials. In another embodiment, the lower substrate 140A and the upper substrate 140C may be made of transparent polymer materials, such as polymethyl methacrylate, polyimide, combinations thereof and / or other suitable materials.

[0021] In some embodiments, the second polarizing layer 150 may be made of polyvinyl alcohol or other suitable materials. The second polarizing layer 150 is used to effectively eliminate the influence of reflected light and scattered light after the light passing through the ferroelectric liquid crystal layer 120, the first polarizing layer 130, and the liquid crystal panel 140 passes through the second polarizing layer 150. For example, in this embodiment, the second polarizing layer 150 has a polarization direction parallel to the Y direction to eliminate the influence of reflected light and scattered light in the X direction. However, it should be noted that the configuration of the second polarizing layer 150 can be changed according to functional requirements and is not limited thereto.

[0022] Please refer to Figure 2A, which is a schematic diagram of the liquid crystal display module 100 in Figure 1. For ease of explanation, only the backlight module 110, the ferroelectric liquid crystal cell region 120B of the ferroelectric liquid crystal layer 120, and the liquid crystal panel 140 are shown here. In detail, the backlight module 110, the ferroelectric liquid crystal cell region 120B of the ferroelectric liquid crystal layer 120, and the liquid crystal panel 140 can be designed to include a plurality of regions. For example, the backlight module 110 may include a display area DA and a peripheral area PA adjacent to the display area DA, wherein the display area DA may include eight independently controllable elongated dimming areas D1 to D8, which are arranged sequentially along the X direction. The ferroelectric liquid crystal cell region 120B of the ferroelectric liquid crystal layer 120 may include eight independently controllable elongated sub-regions S1 to S8, which are arranged sequentially along the X direction. The backlight module 110 has a light-emitting surface 110D, which contains a plurality of partitions, such as eight independently controllable elongated partitions SC1 to SC8, wherein partitions SC1 to SC8 are arranged sequentially along the X direction. However, it should be noted that the display area DA, the ferroelectric liquid crystal cell region 120B, or the light-emitting surface 110D can be designed arbitrarily and are not limited thereto.

[0023] It is worth mentioning that one of the dimming areas D1 to D8 can overlap with one of the sub-regions S1 to S8, and one of the sub-regions S1 to S8 can overlap with the partitions SC1 to SC8. For example, dimming area D1 can overlap with sub-region S1, and sub-region S1 can overlap with partition SC1. Since the overlapping methods of dimming areas D2 to D8, sub-regions S2 to S8, and partitions SC2 to SC8 are similar to those of dimming area D1, sub-region S1, and partition SC1, they will not be described in detail here.

[0024] Please refer to Figures 2B and 2A together. Figure 2B is an example of the opening mode of the liquid crystal display module 100 in Figure 2A. In this embodiment, the light source in partitions SC1 to SC8 (e.g., the light-emitting element 110B in Figure 1) can be a scanning light source, and emit different colors of light in sequence, such as blue, red, and green in sequence. However, it should be noted that the light source in partitions SC1 to SC8 is not limited to this. The following uses the liquid crystal display module 100 displaying red as an example. Since other colors can be derived by analogy, they will not be described in detail here.

[0025] During the time intervals T11 to T14 of frame time FT1, the grayscale values ​​GL1 to GL8 of the dimming areas D1 to D8 of the liquid crystal panel 140 can be controlled and maintained at their minimum values ​​by voltage / current signals. For example, the grayscale values ​​GL1 to GL8 of the dimming areas D1 to D8 of the liquid crystal panel 140 can be 0, so that the dimming areas D1 to D8 remain off. Next, during frame times FT2 and FT3, the grayscale values ​​GL1 to GL8 of the dimming areas D1 to D8 of the liquid crystal panel 140 sequentially increase from their minimum values ​​to their maximum values. For example, the grayscale values ​​GL1 and GL2 of dimming areas D1 and D2 start to increase from the time interval T21 of frame time FT2, and reach their maximum values ​​sequentially in the time interval T24 of frame time FT2 and the time interval T31 of frame time FT3, respectively. For example, the grayscale values ​​GL1 and GL2 of dimming areas D1 and D2 can be 255, so that the dimming areas D1 and D2 are turned on. The grayscale values ​​GL3-GL6 of dimming zones D3-D6 sequentially increase from time interval T22 of frame time FT2, and reach their maximum values ​​sequentially in time intervals T31 and T32 of frame time FT3, respectively, thus activating dimming zones D3-D6. The grayscale values ​​GL7 and GL8 of dimming zones D7 and D8 sequentially increase from time interval T23 of frame time FT2, and reach their maximum values ​​sequentially in time interval T33 of frame time FT3, thus activating dimming zones D7 and D8. Then, in frame times FT3 and FT4, the grayscale values ​​GL1-GL8 of dimming zones D1-D8 of the LCD panel 140 sequentially decrease from their maximum values ​​to their minimum values. For example, the grayscale values ​​GL1-GL3 of dimming zones D1-D3 begin to decrease from time interval T31 of frame time FT3, and reach their minimum values ​​sequentially at time interval T34 of frame time FT3 and time interval T41 of frame time FT4, respectively. For instance, the grayscale values ​​GL1-GL3 of dimming zones D1-D3 can be 0 to turn off dimming zones D1-D3. The grayscale values ​​GL4-GL6 of dimming zones D4-D6 begin to decrease sequentially from time interval T32 and time interval T33 of frame time FT3, and reach their minimum values ​​sequentially at time interval T41 and T42 of frame time FT4, respectively, to turn off dimming zones D4-D6. The grayscale values ​​GL7 and GL8 of dimming zones D7 and D8 begin to decrease sequentially from time interval T33 of frame time FT3, and reach their minimum values ​​sequentially at time interval T43 of frame time FT4, to turn off dimming zones D7 and D8.

[0026] During frame times FT1 and FT2, the light sources in partitions SC1 to SC8 are sequentially turned on and off. Specifically, during time interval T14 of frame time FT1 and time intervals T21 to T23 of frame time FT2, the light sources in partitions SC1 to SC8 are sequentially turned on and off. The light sources in partitions SC1 to SC8 emit blue light, and the emission time of the light sources in partitions SC1 to SC8 is substantially the same as either time interval T14 or time intervals T21 to T23. At this time, the grayscale values ​​GL1 to GL8 of the dimming areas D1 to D8 of the liquid crystal panel 140 are maintained at their minimum values, causing the dimming areas D1 to D8 to be turned off, thereby preventing the blue light emitted by the light sources in partitions SC1 to SC8 from penetrating the liquid crystal panel 140. During frame times FT2 and FT3, the light sources in partitions SC1 to SC8 are sequentially turned on and off. Specifically, during the time interval T24 of frame time FT2 and the time intervals T31-T33 of frame time FT3, the light sources in sections SC1-SC8 are sequentially turned on and off. The light sources in sections SC1-SC8 emit red light, and the emission time of the light sources in sections SC1-SC8 is substantially the same as either time interval T24 or time intervals T31-T33. During frame time FT3 and FT4, the light sources in sections SC1-SC8 are sequentially turned on. Specifically, during the time interval T34 of frame time FT3 and the time intervals T41-T43 of frame time FT4, the light sources in sections SC1-SC8 are sequentially turned on and off. The light sources in sections SC1-SC8 emit green light, and the emission time of the light sources in sections SC1-SC8 is substantially the same as either time interval T34 or time intervals T41-T43. At this time, the grayscale values ​​GL1 to GL8 of the dimming areas D1 to D8 of the LCD panel 140 drop from the maximum value to the minimum value, causing the dimming areas D1 to D8 to be turned off, thereby preventing the green light emitted by the light source in partitions SC1 to SC8 from penetrating the LCD panel 140.

[0027] During frame time FT1, sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B are sequentially turned off along direction X, wherein the turning-off times of sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B can overlap with each other. Specifically, during the time interval T11 to T13 of frame time FT1, the grayscale values ​​GF1 to GF8 of sub-regions S1 to S8 can be sequentially switched to the minimum value, thereby causing the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B to be sequentially turned off along direction X, wherein the grayscale values ​​GF1 to GF8 of sub-regions S1 to S8 can be 0. The off time of one of the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B partially overlaps with the off time of the other sub-region S1 to S8 of the ferroelectric liquid crystal cell region 120B, and also overlaps with the off time of the light source in partitions SC1 to SC8, wherein the off time of the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B is three times the emission time of the light source in partitions SC1 to SC8.

[0028] During frame time FT1 and frame time FT2, sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B are sequentially turned on along direction X. Specifically, during time interval T14 of frame time FT1, the grayscale values ​​GF1 to GF3 of sub-regions S1 to S3 can sequentially switch from minimum to maximum values, thereby causing the sub-regions S1 to S3 of the ferroelectric liquid crystal cell region 120B to be turned on sequentially along direction X. The grayscale values ​​GF1 to GF3 of sub-regions S1 to S3 can be 255, and the turning time of one of the sub-regions S1 to S3 of the ferroelectric liquid crystal cell region 120B overlaps with the turning time of one of the partitions SC1 to SC3. During the time interval T21~T23, the grayscale values ​​GF4~GF8 of sub-regions S4~S8 can sequentially switch from the minimum value to the maximum value, thereby causing sub-regions S4~S8 of the ferroelectric liquid crystal cell region 120B to sequentially open along the X direction. The grayscale values ​​GF4~GF8 of sub-regions S4~S8 can be 255, and the opening time of one of the sub-regions S4~S8 of the ferroelectric liquid crystal cell region 120B overlaps with the opening time of one of the partitions SC4~SC8. In this way, blue light emitted by the light source in partitions SC1~SC8 can penetrate to the liquid crystal panel 140.

[0029] During frame time FT2, sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B are sequentially closed along direction X, and sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B can block the penetrating light source generated by partitions SC1 to SC8. The closing times of sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B can overlap with each other. Specifically, during the time intervals T21 to T23 of frame time FT2, since the grayscale values ​​GL1 to GL8 of dimming areas D1 to D8 begin to rise respectively, and the light source in partitions SC2 to SC8 has not yet been closed, the blue light emitted by the light source in partitions SC2 to SC8 can penetrate to dimming areas D1 to D8. During the time interval T24 of frame time FT2, since the light source in partitions SC1 to SC3 has not yet been closed before the grayscale values ​​GL2 to GL8 of dimming areas D2 to D8 rise to their maximum values ​​respectively, the red light emitted by partitions SC1 to SC3 can penetrate to dimming areas D2 to D8. Therefore, during frame time FT2, the grayscale values ​​GF1 to GF8 of sub-regions S1 to S8 can sequentially switch from the maximum value to the minimum value, causing sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B to sequentially close along direction X, thereby blocking the transmitted light source generated by partitions SC1 to SC8 (for example, blue light in time interval T21 to T23 and red light in time interval T24). The grayscale values ​​GF1 to GF8 of sub-regions S1 to S8 can be 0. Sub-region S1 remains closed in time interval T21 to T23, sub-regions S2 and S3 remain closed in time interval T21 to T24, sub-region S4 remains closed in time interval T22 to T24, sub-regions S5 and S6 remain closed in time interval T22 to T31, and sub-regions S7 and S8 remain closed in time interval T23 to T32. Furthermore, the off time of one of the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B partially overlaps with the off time of the other sub-region S1 to S8 of the ferroelectric liquid crystal cell region 120B, and also overlaps with the off time of the light source in partitions SC1 to SC8, wherein the off time of the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B is three times the emission time of the light source in partitions SC1 to SC8.

[0030] During frame time FT2 and frame time FT3, sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B are sequentially turned on along direction X. Specifically, during the time interval T24 of frame time FT2, the grayscale values ​​GF1 to GF3 of sub-regions S1 to S3 can sequentially switch from the minimum value to the maximum value, thereby causing the sub-regions S1 to S3 of the ferroelectric liquid crystal cell region 120B to be turned on sequentially along direction X. The grayscale values ​​GF1 to GF3 of sub-regions S1 to S3 can be 255, and the turning time of one of the sub-regions S1 to S3 of the ferroelectric liquid crystal cell region 120B overlaps with the turning time of one of the partitions SC1 to SC3. During the time interval T31~T33 of frame time FT3, the grayscale values ​​GF1~GF8 of sub-regions S1~S8 can sequentially switch from minimum to maximum values, thereby causing sub-regions S1~S8 of the ferroelectric liquid crystal cell region 120B to sequentially open along direction X. Among them, the grayscale values ​​GF4~GF8 of sub-regions S4~S8 can be 255, and the opening time of one of the sub-regions S4~S8 of the ferroelectric liquid crystal cell region 120B overlaps with the opening time of one of the partitions SC4~SC8. In this way, the red light emitted by the light source in partitions SC1~SC8 can penetrate to the liquid crystal panel 140.

[0031] During frame time FT3, sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B are sequentially closed along direction X, and sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B can block the light source transmitted by partitions SC1 to SC8. The closing times of sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B can overlap with each other. Specifically, during time intervals T31 to T33 of frame time FT3, since the grayscale values ​​GL1 to GL8 of dimming areas D1 to D8 begin to decrease respectively, and the light source in partitions SC2 to SC8 has not yet been closed, the red light emitted by the light source in partitions SC2 to SC8 can penetrate to dimming areas D1 to D8. During time interval T34 of frame time FT3, since the light source in partitions SC1 to SC3 has not yet been closed before the grayscale values ​​GL2 to GL8 of dimming areas D2 to D8 decrease to their minimum values, the green light emitted by partitions SC1 to SC3 can penetrate to dimming areas D2 to D8. Therefore, during frame time FT3, the grayscale values ​​GF1 to GF8 of sub-regions S1 to S8 can sequentially switch from the maximum value to the minimum value, causing sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B to sequentially close along direction X, thereby blocking the transmitted light source generated by partitions SC1 to SC8 (e.g., red light in time intervals T31 to T33 and green light in time interval T34). The grayscale values ​​GF1 to GF8 can be 0. Sub-region S1 remains closed during time intervals T31 to T33, sub-regions S2 and S3 remain closed during time intervals T31 to T34, sub-region S4 remains closed during time intervals T32 to T34, sub-regions S5 and S6 remain closed during time intervals T32 to T41, and sub-regions S7 and S8 remain closed during time intervals T33 to T42. Furthermore, the off-time of one of the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B partially overlaps with the off-time of the other sub-region S1 to S8 of the ferroelectric liquid crystal cell region 120B, and also overlaps with the off-time of the light source in partitions SC1 to SC8. The off-time of the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B is three times the emission time of the light source in partitions SC1 to SC8. Moreover, in frame time FT4, the activation sequence of partitions SC1 to SC8 of the backlight module 110, the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B, and the dimming zones D1 to D8 of the liquid crystal panel 140 is the same as the activation sequence in frame time FT1. In this way, when the grayscale of one of the dimming areas D1 to D8 changes, the ferroelectric liquid crystal cell region 120B of the ferroelectric liquid crystal layer 120 can block the transmitted light from the backlight module 110 corresponding to the other dimming areas D1 to D8, thereby effectively solving the light amplification problem of the liquid crystal display module 100. Ferroelectric liquid crystal cell region 120B of the ferroelectric liquid crystal layer 120.

[0032] It is worth mentioning that, in order to prevent the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B from blocking the transmitted light caused by the light source in the partitions SC1 to SC8 of the backlight module 110 before the dimming areas D1 to D8 of the liquid crystal panel 140 are fully turned on or completely turned off, the frame rate of the ferroelectric liquid crystal layer 120 can be designed to be greater than the frame rate of the liquid crystal panel 140 and the duty cycle of the light source in the partitions SC1 to SC8 of the backlight module 110. For example, in this embodiment, the frame rate of the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B is the frame rate of the liquid crystal panel 140 divided by the duty cycle of the light source in the partitions SC1 to SC8 of the backlight module 110.

[0033] Please refer to Figures 3A to 3G together. Figure 3A shows an example of the backlight pattern of the composite liquid crystal display module 100, and Figures 3B to 3G are schematic diagrams of the opening sequence of the ferroelectric liquid crystal cell region 120B in Figure 3A at different stages. Since each of the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B can be controlled independently, the backlight module 110 does not need to consider the duty cycle design and scanning design, and the liquid crystal display module 100 can also achieve a scanning backlight design. The following uses the display module 100 displaying red as an example. Since other colors can be obtained by analogy, they will not be described in detail here. In detail, in this embodiment, the backlight module 110 adopts direct-lit backlight or edge-lit backlight. For example, the backlight module 110 continuously displays red light. Sub-regions S2 to S7 of the ferroelectric liquid crystal cell region 120B are sequentially partially turned on, while sub-regions S1 and S8 of the ferroelectric liquid crystal cell region 120B remain closed. Sub-regions S2 to S7 of the ferroelectric liquid crystal cell region 120B can display the backlight module 110. The red light from sub-regions S2 to S7 of the ferroelectric liquid crystal cell region 120B and the backlight module 110 can be combined to form the backlight pattern of the liquid crystal display module 100. In this way, by designing sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B to perform local dimming, the direct-lit or edge-lit backlight module 110 achieves local dimming, thereby improving the contrast of the liquid crystal display module 100 and reducing the cost of the backlight module 110.

[0034] Figures 4A to 4C show another example of the backlight pattern of the composite liquid crystal display module 100. The following example only uses sub-region S7 of the ferroelectric liquid crystal cell region 120B. Since sub-regions S1 to S6 and S8 of the ferroelectric liquid crystal cell region 120B can be derived by analogy, they will not be described in detail here. In this embodiment, the backlight module 110 employs direct-lit global dimming or edge-lit global dimming. For example, the backlight module 110 sequentially displays red, green, or blue light. Sub-region S7 of the ferroelectric liquid crystal cell region 120B can be turned on independently, and sub-region S7 of the ferroelectric liquid crystal cell region 120B can display the red, green, or blue light of the backlight module 110. In this way, by designing the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B to be scanned row-wise, the sub-regions S1 to S8 of the ferroelectric liquid crystal cell region 120B and the backlight module 110 can be combined to form the backlight pattern of the liquid crystal display module 100. This eliminates the need for microchip control in direct-lit or edge-lit backlight modules 110 to achieve local dimming effects, thereby improving the contrast of the liquid crystal display module 100 and reducing the cost of the backlight module 110.

[0035] Some embodiments of this disclosure provide a liquid crystal display module. By providing a ferroelectric liquid crystal layer between the backlight module and the liquid crystal display panel, it can block the light source outside the target area before the liquid crystal display panel is fully turned on or off. In this way, the light amplification problem of the display panel can be effectively solved, thereby reducing light source color mixing and improving the color gamut. In addition, the number of regions of the plurality of ferroelectric liquid crystal cells in the ferroelectric liquid crystal layer can be designed to be independently controlled, so that the backlight module does not need to consider duty cycle design and scanning design, and the effect of a scanning backlight module can be achieved solely by the ferroelectric liquid crystal layer. In this way, the backlight module does not need to use microchip control, which can reduce the cost and energy consumption of the backlight module.

[0036] The foregoing summary outlines features of several embodiments, enabling those skilled in the art to better understand the various aspects of this application. Those skilled in the art should understand that they can readily use this application as a basis for designing or modifying other processes and structures to achieve the same purposes and / or advantages of the embodiments introduced herein. Those skilled in the art should also recognize that such equivalent constructions do not depart from the spirit and scope of this application, and various changes, substitutions, and modifications can be made herein without departing from the spirit and scope of this application. [Simplified Explanation of the Diagram]

[0037] To gain a more complete understanding of the embodiments and their advantages, the following description is now made in conjunction with the accompanying drawings, in which: FIG1 is an exploded view of a liquid crystal display module according to a partial embodiment of the present disclosure; FIG2A is a schematic diagram of the liquid crystal display module of FIG1; FIG2B is an example of the opening mode of the liquid crystal display module of FIG2A; FIG3A is an example of the backlight pattern of the composite liquid crystal display module; FIG3B to FIG3G are schematic diagrams of the opening sequence of the ferroelectric liquid crystal cell region of FIG3A at different stages; and FIG4A to FIG4C are another example of the backlight pattern of the composite liquid crystal display module.

Claims

1. A liquid crystal display module, comprising: One backlight module; A ferroelectric liquid crystal layer is disposed on the backlight module; And a liquid crystal panel disposed on the ferroelectric liquid crystal layer, wherein a display area of ​​the liquid crystal panel has a plurality of dimming areas; wherein when the grayscale of one of the dimming areas changes, the ferroelectric liquid crystal layer is used to block the transmitted light of the backlight module corresponding to the other dimming areas.

2. The liquid crystal display module as described in claim 1, wherein the ferroelectric liquid crystal layer comprises a plurality of ferroelectric liquid crystal cell regions arranged along an X direction, the ferroelectric liquid crystal cell regions being sequentially turned off along the X direction during a frame time.

3. The liquid crystal display module as claimed in claim 2, wherein during the frame time, a first off time of one of the ferroelectric liquid crystal cell regions partially overlaps with a second off time of the other of the ferroelectric liquid crystal cell regions.

4. The liquid crystal display module as described in claim 2, wherein the screen time includes a first time interval and a second time interval, and a first grayscale value of the ferroelectric liquid crystal layer in the first time interval is less than a second grayscale value of the ferroelectric liquid crystal layer in the second time interval.

5. The liquid crystal display module as described in claim 4, wherein the first grayscale value is the minimum grayscale value in the frame time.

6. The liquid crystal display module as described in claim 4, wherein the second grayscale value is the maximum grayscale value during the frame time.

7. The liquid crystal display module as claimed in claim 2, wherein the backlight module has a light-emitting surface and the light-emitting surface comprises a plurality of partitions, one of the ferroelectric liquid crystal cell regions overlapping one of the partitions.

8. The liquid crystal display module as claimed in claim 7, wherein during the frame time, a first on-time of the ferroelectric liquid crystal cell regions overlaps with a second on-time of the partitions.

9. The liquid crystal display module as claimed in claim 7, wherein during the frame time, a first off time of the ferroelectric liquid crystal cell regions overlaps with a third off time of the partitions.

10. The liquid crystal display module as claimed in claim 1, wherein a first frame rate of the ferroelectric liquid crystal layer is greater than a second frame rate of the liquid crystal panel.

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